In previous posts we
have studied how the area and position of the window affects the daylight in a
room. As we know, the amount of light that comes into a room is directly
proportional to the surface of the window. We also know that as higher the
window lintel, the deeper the light.

A study to develop is
the spacing between windows. We are going to observe the office model where
different vertical windows are located. The window is resized, keeping the height of the lintel and varying the
spacing between the jambs:

As we can see, the
windows that are located far apart leave dark areas between them, causing
uneven illumination. Moreover, the closer windows allow greater uniformity of
light.

Accordingly, we
conclude that the optimal spacing between windows is ½ the height of the
lintel. If the windows are separated more than that distance, dark areas occur.
If the windows spacing is less than that measure, the uniformity is preserved.

This work has been
developed by the New Buildings Institute, which has done a great job in
collaboration with the University of Idaho and Washington. My sincere
congratulations for this study.

I hope that with this
final note we will know more about the design of windows. Much remains to be
discovered, such as how to quantify light produced by a window, but these
issues will develop in future extensive notes.